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Ford Tractors Discussion Forum

172 gas won’t start

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Author  [Modern View]

05-22-2020 09:39:05

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This 4140 with 172 gas has started instantly in the 6 months I’ve owned it. Same this morning, except I backed it out of the shed and it quit.
1. The fuel bowl is full and clean
2. Pulling the drain under the carb shows good fuel flow
3. Points are clean and set properly
4. With dist cap off, can see the points sparking 5. Removed wires from coil and cleaned terminals
6. Pulled lead wire from distributor to watch for spark. (It is the kind of wire with no copper, some sort of black fiber)
7. Spark seems weak. I can barely see it in daylight
8. Pulled a wire from a spark plug to watch the spark. Didn’t see the spark but got a whale of a shock
9. I know better, but shot a bit of starter fluid into the air intake

Nothing has changed since it was used a few days ago. It has spark and fuel. Any ideas are much appreciated. —Peter

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David G

05-22-2020 10:59:38

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 Re: 172 gas won’t start in reply to petertay, 05-22-2020 09:39:05  
Sparking points can indicate bad condenser.

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05-22-2020 09:41:42

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 Re: 172 gas won’t start in reply to petertay, 05-22-2020 09:39:05  
I should add that it has been converted to 12 volt, neg ground.

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05-22-2020 10:56:03

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 Re: 172 gas won’t start in reply to petertay, 05-22-2020 09:41:42  
Does coil have internal resister? If not and no external your points maybe bad. Also is coil 12 volt?

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05-22-2020 13:04:12

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 Re: 172 gas won’t start in reply to miner09, 05-22-2020 10:56:03  
No moisture. Thanks for asking.
The coil is Echlin IC-9, 6V, oil filled. Doesn’t indicate internal resistor, but there is a resister up by the gauges with two white wires clipped to it. Cant trace the white wire from the coil, because it disappears into a wiring harness.

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05-22-2020 15:17:52

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 Re: 172 gas won’t start in reply to petertay, 05-22-2020 13:04:12  
The wire from the + side of the coil does go to the resistor. So if I buy a new coil, would it be better to get a 6V or 12V?
Also, are points and condenser the same at 6 or 12 volts? —Peter

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